"A problem is a chance for you to do your best." --Duke Ellington
"The best way to escape from a problem is to solve it." --Brendan Francis
"Gedanken" is a German word for "thought". A thought experiment is one you carry out in your head. In physics, the term "gedanken experiment" is used to refer to an experiment that is impractical to carry out, but useful to consider because it can be reasoned about theoretically. It was a favorite method of renowned physicist Albert Einstein.